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Mixed Wiring

Former Community Member
Former Community Member
We have been invited to tender for the rewire of lighting and power to a government building.
The single compartment trunkings carry recently installed ELV cabling consisting of fire alarm and general alarm cabling. We have been asked to replace the existing LV singles.
Existing services to the ceilings means there is no capacity left to install new containment and would almost be impossible to install.
To install the LV wiring would depart from BS7671 528.1 / 515.2 / 528.3 along with BS5839 and BS8519
7671 states ‘Any intended departure from these Parts requires special consideration by the designer of the installation and shall be recorded on the appropriate electrical certification specified in Part 6. The resulting degree of safety of the installation shall be not less than that obtained by compliance with the Regulations.’
Since there is no design or intervention by any electrical consultants I would assume we become the designers simply by installing the cables into the trunkings and terminating into the various items of equipment.
As a result I wouldn’t say that the resulting degree of safety of the installation shall be not less than that obtained by compliance with the Regulations is met, as stated above.
Is just merely noting the departure on the EIC sufficient or should I be looking for some form of written agreement that the installation will not comply with current standards.

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    Ah... then it is likely that existing light and power [ in the containment ] was disconnected at source after fire damage, then minimal electrical supplies maintained at the origin of the building and fire cabling put in after the light/power made safe for the void period. The cheeky thing is the ELV is probably all fine compliance wise as all the LV stuff it shares compartments with is dead and now just spare copper.  I would ask if there was fire and security cabling before the fire, if so what happened to it and where was it routed? May be simplistic,as only you have seen the install, but can the ELV stuff be lifted out of containment and something else be done with it. You then have the containment back for its original use.
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    Ah... then it is likely that existing light and power [ in the containment ] was disconnected at source after fire damage, then minimal electrical supplies maintained at the origin of the building and fire cabling put in after the light/power made safe for the void period. The cheeky thing is the ELV is probably all fine compliance wise as all the LV stuff it shares compartments with is dead and now just spare copper.  I would ask if there was fire and security cabling before the fire, if so what happened to it and where was it routed? May be simplistic,as only you have seen the install, but can the ELV stuff be lifted out of containment and something else be done with it. You then have the containment back for its original use.
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